Lewis Hamilton insists he is not concerned about Mercedes' recent slump in form ahead of his arrival at the team next year.

After the Singapore Grand Prix, Hamilton signed a deal to join Mercedes from McLaren for 2013 and since then Mercedes has failed to score a single point.

Asked in Abu Dhabi if Mercedes' struggle for performance worried him, Hamilton said: "It doesn't. I'm very happy with the decision I've made and it doesn't have an impact on that.

"People do sometimes lose their way and even we have struggled in the past. I've not really focused on them to see what problems they've had, be it crashing or whatever. I've been focused on trying to win the constructors' championship for this team [McLaren] and trying to get the maximum points. It is theoretically still possible for us to win the constructors' championship so I'm still all guns blazing."

Hamilton said he was aware of the scale of the challenge of joining Mercedes when he signed his new contract.

"I already knew how big it was," he added. "I thought really hard about how big it was, and perhaps it's growing as a task, but I'm excited about it. I'm really, really excited to meet the new people and be in a different environment and get to mould myself in that environment."

Current team-mate Jenson Button said Hamilton's departure would be a "big loss" for McLaren, but added that Hamilton would face challenges of his own.

"The first year with a new team is always a little bit tricky and it will be a new experience for Lewis. I'm sure he is excited about it, and he's as quick as they come, but sometimes it just isn't that easy to win grands prix and build a team around you."